Stillpoints Ultra 5

I did try Vibropods under cd player, they did okay.

Wolf, you must be kidding us. Under speakers you want either spikes or something that absorbs energy very well. That rubber is neither.
I use both Polycrystal spikes and Boston Audio tuneblocks for speakers with excellent results. Never tried anything else except stock spikes, that were junk.

With these things one cannot really guess, you have to try both. It may also be not better/worse but different. Even more reason to try.